WO2004032531A2 - Determination of code transmit power range in downlink power control for cellular systems - Google Patents
Determination of code transmit power range in downlink power control for cellular systems Download PDFInfo
- Publication number
- WO2004032531A2 WO2004032531A2 PCT/US2003/031327 US0331327W WO2004032531A2 WO 2004032531 A2 WO2004032531 A2 WO 2004032531A2 US 0331327 W US0331327 W US 0331327W WO 2004032531 A2 WO2004032531 A2 WO 2004032531A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- code
- upper bound
- transmit power
- determining
- sir
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/16—Deriving transmission power values from another channel
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
Definitions
- This invention generally relates to cellular networks and more particularly to determination of code transmit power for use in power control.
- UMTS Universal Mobile Telecommunication System
- a RAKE receiver is used for frequency division duplex (FDD)
- a multi-user detector (MUD) receiver is used for time division duplex (TDD)
- the difference between the transmit power of two codes in the same cell has to be within a certain range to assure that the receiver works properly.
- the maximum allowed difference is called the dynamic range of the receiver. Because the total transmit power (i.e., carrier power) in the downlink is limited, an appropriate range of transmit power for each code should be determined to allow the power control to adjust the difference of code transmit powers to be in the dynamic range as much as possible.
- the invention provides a method and apparatus employing an algorithm for determining the range of transmit power for each code in the downlink properly for all modes of UMTS systems (including FDD, high chip rate (HCR) TDD, and low chip rate (LCR) TDD).
- the invention provides details of the preferred implementation. While the following description makes reference to downlink power control for CDMA systems as an example, it is to be noted that the invention is applicable for uplink power control and is also usable in cellular systems other than those mentioned above.
- Figure 1 illustrates diagrammatically a first embodiment in the form of a flow chart for determination of code transmit power range in downlink
- Figure 2 illustrates diagrammatically a second embodiment in the form of a flow chart.
- the transmit power range lies between the upper bound and lower bound of the transmit power of a particular code.
- the method of the present invention determines an appropriate transmit power range (especially the upper bound) for each code so that when the transmit power of any code approaches its upper bound, the transmit power of other codes can be adjusted to stay within the dynamic range.
- the solution of two present inventions determines the range of code transmit power using at least some of the following parameters: 1) number of codes in the downlink (time slot, if TDD); 2) the range of the SIR target of the code; 3) the maximum allowed dynamic range of the receiver used at the UE (dynamic power range of the receiver is the maximum allowed difference between transmit power of any codes); 4) average MUD efficiency factor in the downlink (for TDD only); 5) average orthogonal factor in the downlink (for FDD only); 6) average inter-cell to intra-cell interference ratio.
- the inventive method permits cellular networks to determine the dynamic range of code transmit power in the downlink power control.
- it is applicable to all modes of UMTS systems (including FDD, HCR TDD, and LCR
- the method 100 of the first embodiment, shown in Figure 1 uses the following information to determine the range of code transmit-power:
- the range of the SIR target of the code i is then obtained (step S2).
- the range is determined by the C-
- the upper bound is the SIR target corresponding to the SIR in the worst case (known as case 1 in the technical literature) and the lower bound is the
- the maximum allowed dynamic range of the receiver used at the UE is
- DR is a design parameter that can be configured by the operator.
- the code transmit power range is determined as follows. First, among all the codes, the code with maximum upper bound SIR target, say code,/, is selected.
- step S3 The upper bound of the transmit power of code i is denoted by TXCode ub (i) which is used as a reference.
- TXCode ub (i) R(i) ⁇ TXCode ub (j) Equation 1
- R( , the desired ratio between TXCode ub (i) and TXCode ub (j) , is ⁇ SIR ub ( if shunt iXKX b XJ ⁇ DR
- the sum of upper bound of code transmit power is subject to the limit of maximum Node B carrier power, CA7X max , (step S5).
- a margin is used to prevent the total code transmit-power to reach the maximum allowed value.
- the margin a design parameter, can be configured by the operator as:
- TXCode ub (i) (CATX max /Margin) Equation 4
- the lower bound of code transmit power, obtained at step S6, is set to the minimum allowed carrier power of the Node B.
- TXCode lb ( ⁇ ) CATX ⁇ n Equation 5
- the code transmit powers are then adjusted to lie within the dynamic range (step S7).
- the method 100 will configure or reconfigure the range of code transmit power whenever the number of codes in the downlink changes, which includes: radio link setup for a new CCTrCH and radio link release for an existing CCTrCH. Accordingly, the method 100 is suitable for a real-time services scenario, where the number of codes changes relatively slowly.
- a second embodiment of a method 200 in accordance with the present invention uses the following information to determine the range of code transmit power: 1) the number of codes in the downlink (time slot, if TDD), denoted by N ; 2) the range of SIR target of the code i: the lower bound SIR lb (i) and upper bound SIR ub (i) which are determined from the BLER requirement; 3) the maximum allowed dynamic range of receiver used at the UE, DR ; 4) average MUD efficiency factor in the downlink (for TDD only), a ; 5) average orthogonal factor in the downlink (for FDD only), a ; 6) average inter-cell to intra-cell interference ratio, ⁇ ; and 7) maximum allowed load in the downlink, Load nux .
- Code transmit power range is then determined as follows: The current load in the downlink (time slot, if TDD) is computed (S13). Among all the codes, the code with maximum upper bound SIR target, say code j, is selected (step S14). [0036] The load contributed by each code i is given by:
- the load in the downlink is controlled by the call admission control function to be no more than the maximum allowed load in the downlink, Load ⁇ mx .
- the limit for the sum of code transmit power upper bounds, obtained at step S14, is set to be proportional to the current load. That is:
- TXCode ub (i) R(i) ⁇ TXCode ub (j) Equation 11
- the code transmit powers are then adjusted to lie within the dynamic range (step S19).
- the method 200 shown in Figure 2 does not necessarily need to configure or reconfigure the range of code transmit power when the number of codes in the downlink changes.
- the transmit power range for a code is determined by its SIR upper bound and maximum SIR upper bound of codes in the downlink (time slot, if TDD).
- the maximum SIR upper bound of codes in the downlink does not change the value of R(i) ⁇ SIR ub (j)
- the range of code transmit power will not change.
- the frequency of reconfiguration of the code transmit power range is much less than the frequency at which the number of codes changes. Therefore, this algorithm is suitable for a non- real-time services scenario, where the number of codes changes quickly. In addition, it is also suitable for a real-time services scenario as well.
- FIG. 1 The flow diagram of Figure 1 shows the preferred sequence of operations for implementing the first algorithm. Initially, the number of the codes in the downlink and the maximum allowed dynamic range are obtained, followed by steps which operate on the data obtained to achieve the desired result. However, the steps may be altered in sequence without departing from the scope of the invention.
- the flow diagram of Figure 2 shows the preferred sequence of operations for implementing the second algorithm.
- the process initially obtains the number of codes in the downlink, the maximum allowed dynamic range, MUD efficiency factor (as applied to TDD only), orthogonal factor (as applied to FDD only), average inter-intracell interference ratio, and maximum allowed load in downlink, followed by operations on these data to achieve the desired result.
- MUD efficiency factor as applied to TDD only
- orthogonal factor as applied to FDD only
- average inter-intracell interference ratio average inter-intracell interference ratio
- maximum allowed load in downlink followed by operations on these data to achieve the desired result.
- the steps may be altered in sequence without departing from the scope of the invention.
- the invention for downlink power control is applicable to other types of communication systems as well.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Transmitters (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03776223A EP1550237B1 (en) | 2002-10-03 | 2003-10-02 | Determination of code transmit power range in downlink power control for cellular systems |
CA002501117A CA2501117A1 (en) | 2002-10-03 | 2003-10-02 | Determination of code transmit power range in downlink power control for cellular systems |
DE60317810T DE60317810T2 (en) | 2002-10-03 | 2003-10-02 | DETERMINATION OF THE CODE TRANSMISSION RANGE IN THE CIRCULATION POWER FOR CELLULAR SYSTEMS |
JP2004541648A JP2006502620A (en) | 2002-10-03 | 2003-10-02 | Downlink power control in cellular systems by determining transmit power range for codes |
AU2003283996A AU2003283996A1 (en) | 2002-10-03 | 2003-10-02 | Determination of code transmit power range in downlink power control for cellular systems |
MXPA05003544A MXPA05003544A (en) | 2002-10-03 | 2003-10-02 | Determination of code transmit power range in downlink power control for cellular systems. |
NO20052148A NO20052148L (en) | 2002-10-03 | 2005-05-02 | Determination of code broadcast power range in downlink power management for cell-based systems |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US41593802P | 2002-10-03 | 2002-10-03 | |
US60/415,938 | 2002-10-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004032531A2 true WO2004032531A2 (en) | 2004-04-15 |
WO2004032531A3 WO2004032531A3 (en) | 2004-09-30 |
Family
ID=32069922
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2003/031327 WO2004032531A2 (en) | 2002-10-03 | 2003-10-02 | Determination of code transmit power range in downlink power control for cellular systems |
Country Status (14)
Country | Link |
---|---|
US (1) | US20040066795A1 (en) |
EP (1) | EP1550237B1 (en) |
JP (1) | JP2006502620A (en) |
KR (2) | KR20050099638A (en) |
CN (1) | CN1703845A (en) |
AT (1) | ATE379884T1 (en) |
AU (1) | AU2003283996A1 (en) |
CA (1) | CA2501117A1 (en) |
DE (1) | DE60317810T2 (en) |
ES (1) | ES2297240T3 (en) |
MX (1) | MXPA05003544A (en) |
NO (1) | NO20052148L (en) |
TW (3) | TW200514452A (en) |
WO (1) | WO2004032531A2 (en) |
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US8422434B2 (en) * | 2003-02-18 | 2013-04-16 | Qualcomm Incorporated | Peak-to-average power ratio management for multi-carrier modulation in wireless communication systems |
KR100547771B1 (en) * | 2003-03-13 | 2006-01-31 | 삼성전자주식회사 | Power Control Method of Wireless Access Node in Wireless LAN System |
US7443821B2 (en) * | 2004-01-08 | 2008-10-28 | Interdigital Technology Corporation | Method for clear channel assessment optimization in a wireless local area network |
DE102004054626B4 (en) * | 2004-11-11 | 2007-05-24 | Siemens Ag | Method for multicode transmission by a subscriber station |
KR100662370B1 (en) | 2004-11-30 | 2007-01-02 | 엘지전자 주식회사 | method for controlling power |
JP4769657B2 (en) * | 2006-07-28 | 2011-09-07 | 京セラ株式会社 | Wireless communication method and wireless communication terminal |
JP4829049B2 (en) * | 2006-08-30 | 2011-11-30 | 京セラ株式会社 | Wireless communication method and wireless base station |
WO2008076050A2 (en) * | 2006-12-21 | 2008-06-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Multi mode outer loop power control in a wireless network |
US9392555B2 (en) * | 2011-10-06 | 2016-07-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Power controller, method, computer program and computer program product for controlling transmission power |
US9307505B2 (en) | 2013-03-12 | 2016-04-05 | Blackberry Limited | System and method for adjusting a power transmission level for a communication device |
US10313854B2 (en) * | 2017-11-08 | 2019-06-04 | International Business Machines Corporation | Listing service registrations through a mobile number |
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2003
- 2003-10-02 US US10/677,717 patent/US20040066795A1/en not_active Abandoned
- 2003-10-02 AU AU2003283996A patent/AU2003283996A1/en not_active Abandoned
- 2003-10-02 JP JP2004541648A patent/JP2006502620A/en not_active Ceased
- 2003-10-02 KR KR1020057017462A patent/KR20050099638A/en not_active Application Discontinuation
- 2003-10-02 CN CNA2003801008918A patent/CN1703845A/en active Pending
- 2003-10-02 DE DE60317810T patent/DE60317810T2/en not_active Expired - Lifetime
- 2003-10-02 ES ES03776223T patent/ES2297240T3/en not_active Expired - Lifetime
- 2003-10-02 EP EP03776223A patent/EP1550237B1/en not_active Expired - Lifetime
- 2003-10-02 TW TW093116957A patent/TW200514452A/en unknown
- 2003-10-02 AT AT03776223T patent/ATE379884T1/en not_active IP Right Cessation
- 2003-10-02 KR KR1020057005844A patent/KR100638702B1/en not_active IP Right Cessation
- 2003-10-02 TW TW092127355A patent/TWI240588B/en not_active IP Right Cessation
- 2003-10-02 MX MXPA05003544A patent/MXPA05003544A/en active IP Right Grant
- 2003-10-02 CA CA002501117A patent/CA2501117A1/en not_active Abandoned
- 2003-10-02 TW TW095137447A patent/TW200733597A/en unknown
- 2003-10-02 WO PCT/US2003/031327 patent/WO2004032531A2/en active IP Right Grant
-
2005
- 2005-05-02 NO NO20052148A patent/NO20052148L/en not_active Application Discontinuation
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US20030076790A1 (en) * | 2000-03-21 | 2003-04-24 | Katsuhiko Hiramatsu | Transmission device |
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Title |
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See also references of EP1550237A2 * |
Also Published As
Publication number | Publication date |
---|---|
US20040066795A1 (en) | 2004-04-08 |
KR20050099638A (en) | 2005-10-14 |
NO20052148D0 (en) | 2005-05-02 |
TW200733597A (en) | 2007-09-01 |
WO2004032531A3 (en) | 2004-09-30 |
ATE379884T1 (en) | 2007-12-15 |
ES2297240T3 (en) | 2008-05-01 |
TWI240588B (en) | 2005-09-21 |
TW200514452A (en) | 2005-04-16 |
EP1550237B1 (en) | 2007-11-28 |
AU2003283996A8 (en) | 2004-04-23 |
KR20050059236A (en) | 2005-06-17 |
CA2501117A1 (en) | 2004-04-15 |
JP2006502620A (en) | 2006-01-19 |
TW200412812A (en) | 2004-07-16 |
CN1703845A (en) | 2005-11-30 |
DE60317810T2 (en) | 2008-10-30 |
EP1550237A4 (en) | 2006-03-01 |
NO20052148L (en) | 2005-06-28 |
MXPA05003544A (en) | 2005-06-03 |
DE60317810D1 (en) | 2008-01-10 |
KR100638702B1 (en) | 2006-10-31 |
EP1550237A2 (en) | 2005-07-06 |
AU2003283996A1 (en) | 2004-04-23 |
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